Judite Ferreira - Academia.edu (original) (raw)

Papers by Judite Ferreira

Lecture notes in networks and systems, 2023

This paper is a synthesis of the development of energy contracting simulator in Portugal "AR... more This paper is a synthesis of the development of energy contracting simulator in Portugal "ARS Simulator". The simulator compares the prices of the energy traders and indicates to consumers the best option to contract energy. To make the comparison, the simulator uses trader's data (energy prices) and the consumer's data (energy bill, threephase or single-phase power supply and equipment's), to estimate its consumption and finally determine which trader will be the best choice.

Neutro à Terra, Jun 12, 2017

Sensors and Actuators B: Chemical, 2016

This research work presents, for the first time, a screen-printed electrode (SPE) made on a PCB b... more This research work presents, for the first time, a screen-printed electrode (SPE) made on a PCB board with silver tracks (Ag) and a three electrode configuration (Ag x O-working, Ag x O-counter and Ag/Ag x Oreference electrodes), following the same approach as printed-circuit boards (PCBs). This low cost and disposable device was tested for screening a cancer biomarker in point-of-care. The selected biomarker was carcinogenic embryonic antigen (CEA) protein, routinely used to follow-up the progression of specific cancer diseases. The biosensor was constructed by assembling a plastic antibody on the Ag-working electrode area, acting as the biorecognition element of the device. The protein molecules that were entrapped on the polymer and positioned at the outer surface of the polypyrrole (PPy) film were removed by protease action. The imprinting effect was tested by preparing non-imprinted (NPPy) material, including only PPy as biorecognition element. Infrared and Raman studies confirmed the surface modification of these electrodes. The ability of the sensing material to rebind CEA was measured by several electrochemical techniques: cyclic voltammetry (CV), impedance spectroscopy (EIS) and square wave voltammetry (SWV). The linear response ranged from 0.05 to 1.25 pg/mL against logarithm concentration. Overall, producing screen-printed electrodes by means of conventional PCB technology showed promising features, mostly regarding cost and prompt availability. The plastic antibody-based biosensor also seems to be a promising tool for screening CEA in point-of-care, with low response time, low cost, good sensitivity and high stability.

Melecon 2010 - 2010 15th IEEE Mediterranean Electrotechnical Conference, 2010

In the energy management of a small power system, the scheduling of the generation units is a cru... more In the energy management of a small power system, the scheduling of the generation units is a crucial problem for which adequate methodologies can maximize the performance of the energy supply. This paper proposes an innovative methodology for distributed energy resources management. The optimal operation of distributed generation, demand response and storage resources is formulated as a mixed-integer linear programming model (MILP) and solved by a deterministic optimization technique CPLEX-based implemented in General Algebraic Modeling Systems (GAMS). The paper deals with a vision for the grids of the future, focusing on conceptual and operational aspects of electrical grids characterized by an intensive penetration of DG, in the scope of competitive environments and using artificial intelligence methodologies to attain the envisaged goals. These concepts are implemented in a computational framework which includes both grid and market simulation. I.

aedie.org

AbstractAround the world, electricity industries are being restructured and liberalised. The Eur... more AbstractAround the world, electricity industries are being restructured and liberalised. The European Union is working towards a Single European Market in electricity. In the liberalised market the buyers can buy the electricity to the more distance generators and ...

Neutro à Terra, 2017

De forma a não comprometer o conforto ou a qualidade de vida, nos dias de hoje, é obrigatório que... more De forma a não comprometer o conforto ou a qualidade de vida, nos dias de hoje, é obrigatório que a energia elétrica esteja presente. Sendo indispensável, torna-se necessário assegurar que a sua distribuição seja feita da forma mais eficiente possível.Uma resposta rápida e eficaz a possíveis falhas que ocorram na rede, irá garantir a tal qualidade de serviço desejada. Para isso, a automatização dos processos é uma grande evolução e objetivo de concretização do setor elétrico.Neste contexto surge o conceito de Smart Grid, que tem como principal objetivo a combinação entre o setor elétrico e a evolução da tecnologia. A par desta característica, estes tipos de redes vêm também trazer evoluções no âmbito ambiental, pois a produção de energia elétrica é feita, maioritariamente, por fontes de energia renovável.Este projeto incide na análise das vantagens técnicas e económicas da inclusão de equipamentos que detêm capacidades de armazenamento de energia, as Baterias de Armazenamento de Ene...

Innovations in Bio-Inspired Computing and Applications, 2021

Innovations in Bio-Inspired Computing and Applications, 2022

Health and Technology, 2018

Endoscopic capsule is a well-known concept that provides minimal invasive assessment of digestive... more Endoscopic capsule is a well-known concept that provides minimal invasive assessment of digestive tract. We describe the work progresses of a capsule-Cap4Uwith the size and shape of a common pill and containing a minute camera. The Cap4U is within the novel embedding Wireless Power Transfer System (WPTS). This technology allows the transmission of electrical energy from an external power source, such as the electrical power grid or a consuming device, without the use of electrical conductor wires. Several techniques architecture used to implements the present novel endoscopy system are explained. The specific requirements of image acquisition in one hand and the limitations in the size of the Cap4U in the otherhand, as well as, the energy restriction and the electromagnetic interferences were considered in the present work in all the technical options carried out. Keywords Capsule endoscopy. Wireless power transmission. Technology. Energy induction Wireless capsule endoscopy is a rapidly emerging technology used for diagnosis of diseases within the gastrointestinal tract. Many wireless capsules found in the literature suffer from limited battery life. These capsules provide limited operation time, as well as, low image rate which affects the clarity of the images taken from the device [1-3]. The Cap4U aims to deploy one approach to the endoscopy that mitigates these compliances. The Cap4U is designed with the small dimensions as similar as the other capsules designs. The presented capsule is battery less that it uses one Wireless Power Transfer System (WPTS). The resonant coils of wire copper were inserted into the capsule to capture the energy in the electromagnetic field.

Renewable Energy and Power Quality Journal, 2003

Power market deregulation imposed the separation of several activities such as power production, ... more Power market deregulation imposed the separation of several activities such as power production, transmission and distribution, with the consequent separation of these activities costs. This article presents and compares methods that allow determining how much and who must pay for the use of the electrical transmission network. This issue is analysed, under the point of view of several transmission system users: generators, loads and transactions being analysed. The advantages and disadvantages of each method, from the point of view of the considered users are discussed. The embedded methods are used as the base of costs calculation, specifically the methods Postage-Stamp and MW-mile and some of its variants. This study is illustrated using a simple nine-bus electrical network that being used by R&D groups for several projects concerning power markets.

The main aims of this work are the development and the validation of one generic algorithm to pro... more The main aims of this work are the development and the validation of one generic algorithm to provide the optimal control of small power wind generators. That means up to 40 kW and blades with fixed pitch angle. This algorithm allows the development of controllers to fetch the wind generators at the desired operational point in variable operating conditions. The problems posed by the variable wind intensity are solved using the proposed algorithm. This is done with no explicit measure of the wind velocity, and so no special equipment or anemometer is required to compute or measure the wind velocity.

Locational Marginal Prices (LMP) are important pricing signals for the participants of competitiv... more Locational Marginal Prices (LMP) are important pricing signals for the participants of competitive electricity markets, as the effects of transmission losses and binding constraints are embedded in LMPs [1],[2]. This paper presents a software tool that evaluates the nodal marginal prices considering losses and congestion. The initial dispatch is based on all the electricity transactions negotiated in the pool and in bilateral contracts. It must be checked if the proposed initial dispatch leads to congestion problems; if a congestion situation is detected, it must be solved. An AC power flow is used to verify if there are congestion situations in the initial dispatch. Whenever congestion situations are detected, they are solved and a feasible dispatch (re-dispatch) is obtained. After solving the congestion problems, the simulator evaluates LMP. The paper presents a case study based on the the 118 IEEE bus test network.

2011 8th International Conference on the European Energy Market (EEM), 2011

AbstractCongestion management of transmission power systems has achieve high relevance in compet... more AbstractCongestion management of transmission power systems has achieve high relevance in competitive environments, which require an adequate approach both in technical and economic terms. This paper proposes a new methodology for congestion ...

2009 IEEE PES/IAS Conference on Sustainable Alternative Energy (SAE), 2009

Abstract Ensuring sustainable development conditions is presently world widely recognized as a cr... more Abstract Ensuring sustainable development conditions is presently world widely recognized as a critically important goal. This makes the use of electricity generation technologies based on renewable energy sources very relevant. Developing countries depend on an ...

2011 IEEE Symposium on Computational Intelligence Applications In Smart Grid (CIASG), 2011

Abstract The concept of demand response has a growing importance in the context of the future pow... more Abstract The concept of demand response has a growing importance in the context of the future power systems. Demand response can be seen as a resource like distributed generation, storage, electric vehicles, etc. All these resources require the existence of an ...

2010 IEEE International Conference on Systems, Man and Cybernetics, 2010

Demand response can play a very relevant role in future power systems in which distributed genera... more Demand response can play a very relevant role in future power systems in which distributed generation can help to assure service continuity in some fault situations. This paper deals with the demand response concept and discusses its use in the context of competitive electricity markets and intensive use of distributed generation. The paper presents DemSi, a demand response simulator that